EP1737051B1 - Backlight assembly including light emitting diode and display device including the same - Google Patents

Backlight assembly including light emitting diode and display device including the same Download PDF

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Publication number
EP1737051B1
EP1737051B1 EP06115376.3A EP06115376A EP1737051B1 EP 1737051 B1 EP1737051 B1 EP 1737051B1 EP 06115376 A EP06115376 A EP 06115376A EP 1737051 B1 EP1737051 B1 EP 1737051B1
Authority
EP
European Patent Office
Prior art keywords
light emitting
light
backlight assembly
emitting diodes
led
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP06115376.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1737051A1 (en
Inventor
Seong-Man Jeon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Display Co Ltd
Original Assignee
LG Display Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LG Display Co Ltd filed Critical LG Display Co Ltd
Publication of EP1737051A1 publication Critical patent/EP1737051A1/en
Application granted granted Critical
Publication of EP1737051B1 publication Critical patent/EP1737051B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/095—Refractive optical elements
    • G02B27/0955—Lenses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/52—Encapsulations
    • H01L33/54—Encapsulations having a particular shape
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs

Definitions

  • a driving circuit 42 is connected to the liquid crystal panel 40 through a flexible printed circuit board (FPCB).
  • a top cover 50 is disposed on the top of the LCD panel. The top cover 50 presses and fixes a peripheral portion of the liquid crystal panel 40 and is combined with the main supporter 30 and the bottom case 10.
  • the backlight assembly 20 includes a plurality of LEDs 22, a reflecting sheet 23, a light guide plate 25, and optical sheets such as a prism sheet 27a and a diffusion sheet 27b.
  • the LEDs 22 are arranged on a plurality of printed circuit boards (PCBs) 21.
  • the PCBs 21 are arranged in parallel on the bottom case 10.
  • the reflecting sheet 23 has a plurality of through holes 24.
  • the through holes 24 correspond to the LEDs 22, and the reflecting sheet 23 covers the PCBs 21 and the bottom case 10.
  • the light guide plate 25 is spaced apart from the LEDs 22 and has a plurality of reflecting dots 26.
  • the reflecting dots 26 correspond to the LEDs 22.
  • the optical sheets 27 are spaced apart from the light guide plate 25.
  • the optical sheets 27 condense and diffuse light passing through the light guide plate 25.
  • the related art LED 22 has the highest luminous intensity at an emission angle of about 80 degrees with respect to a vertical center axis of the LED 22. In other words, most of the light is emitted within the vicinity of 80 degrees from the LED 22 to form a white color light.
  • the invention provides a light emitting diode according to claim 1. Further embodiments of the invention are described in the dependent claims.
  • FIG. 3 is a cross-sectional view of an LED in a backlight assembly according to an exemplary embodiment not part of the present invention.
  • the lens portion 106 has a refractive index higher than air outside the lens portion 106. Accordingly, when light passes through the side surface of the lens portion 106, the refractive angle is higher than the incident angle according to Snell's principle. Therefore, most of the light emitted from the emitting portion 104 goes sideward and is mixed with light emitted from adjacent LEDs to form a white color light.
  • the lens portion 106 has a slanted upper surface 106a to prevent light going directly upward.
  • the slanted upper surface 106a reflects light, which is travelling directly upward, toward a side surface of the LED 100, and thus the color spot is reduced.
  • the slanted upper surface 106a may have a revered cone shape.
  • the slanted upper surface 106a has a slanted angle ⁇ of about 55 to 85 degrees with respect to a center axis of the LED 100. Because the slanted upper surface 106a has a slanted angle ⁇ of about 55 to 85 degrees, most of the light traveling upward reflects from the slanted angle 106a towards the side surface of the lens portion 106.
  • the above simulated examples demonstrate that the color spot can be effectively prevented without use of a light guide plate when the highest luminous intensity is created at an angle of about 67.5 degrees.
  • the color spot can also be effectively prevented without use of the light guide plate when the highest luminous intensity is created at an angle range of about 55 to 80 degrees.
  • the highest luminous intensity will be created at an angle range of about 55 to 80 degrees when the slanted upper surface has a slanted angle of about 55 to 85 degrees.
  • most of the light emitted from the LED (100 of FIG. 3 ) is distributed within an emission angle range of about 50 to 90 degrees, and the highest luminous intensity is created at an emission angle range of about 60 to 70 degrees.
  • the light guide plate of the related art can be omitted in the backlight assembly of the exemplary embodiment.
  • the color spot can be substantially prevented without use of the light guide panel.
  • the lens portion (106 of FIG. 3 ) may be made of a material having a refractive index of about 1.49 to 1.51, such as polymethylmethacrylate (PMMA) and silica.
  • PMMA polymethylmethacrylate
  • silica silica
  • FIG. 6 is a cross-sectional view of an LED according to an exemplary embodiment of the present invention.
  • the LED 100 further includes a reflector 108, which is coated on the slanted upper surface 106a.
  • the reflector 108 has a high reflectance to shield the emitted light going directly upward and may be made of a metal such as aluminum (Al).
  • the LCD module of the exemplary embodiments is explained in brevity, with reference to FIGs. 1 , 3 and 6 .
  • the LCD module of the exemplary embodiments is similar to the related art LCD module, except for use of the light guide plate and structure of the LED.
  • the backlight assembly 20 and the liquid crystal panel 40 are sequentially disposed on the bottom case 10.
  • the main supporter 30 has a rectangular frame shape and supports the backlight assembly 20 and the liquid crystal panel 40.
  • the main supporter 30 is combined with the bottom case 10.
  • the driving circuit is connected to the liquid crystal panel 40 through a flexible printed circuit board (FPCB).
  • the top cover 50 is disposed on top of the LCD panel 40. The top cover 50 presses and fixes the peripheral portion of the liquid crystal panel 40 and is combined with the main supporter 30 and the bottom case 10.
  • the backlight assembly 20 includes a plurality of LEDs 100, the reflecting sheet 23 and the optical sheets 27 such as the prism sheet 27a and the diffusion sheet 27b.
  • the LEDs 100 are arranged on a plurality of printed circuit boards (PCBs) 21.
  • the PCBs 21 are arranged in parallel on the bottom case 10.
  • the reflecting sheet 23 has the plurality of through holes 24.
  • the through holes 24 correspond to the LEDs 22 and the reflecting sheet 23 covers the PCBs 21 and the bottom case 10.
  • the optical sheets 27 are disposed directly over the LEDs 100 and condense and diffuse light emitted from the LEDs 100 and reflecting from the reflecting sheet 23. In other words, in the exemplary embodiments, because the light guide plate is not needed, the transparent portions of the optical sheets 27 are disposed directly over the LEDs 100, as opposed to the reflecting dots of the light guide plate.
  • the LEDs 100 includes red, green and blue color LEDs of the same number.
  • the red, green and blue color LEDs may turn on simultaneously to mix colors, thereby forming a white color.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)
  • Led Device Packages (AREA)
  • Liquid Crystal (AREA)
EP06115376.3A 2005-06-24 2006-06-13 Backlight assembly including light emitting diode and display device including the same Active EP1737051B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020050054962A KR20060135207A (ko) 2005-06-24 2005-06-24 휘도를 개선한 발광다이오드 램프 및 이를 이용하는백라이트 어셈블리

Publications (2)

Publication Number Publication Date
EP1737051A1 EP1737051A1 (en) 2006-12-27
EP1737051B1 true EP1737051B1 (en) 2018-01-17

Family

ID=37101887

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06115376.3A Active EP1737051B1 (en) 2005-06-24 2006-06-13 Backlight assembly including light emitting diode and display device including the same

Country Status (5)

Country Link
US (1) US20060291205A1 (zh)
EP (1) EP1737051B1 (zh)
JP (1) JP4824484B2 (zh)
KR (1) KR20060135207A (zh)
CN (1) CN1885128A (zh)

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JP5383101B2 (ja) * 2008-06-23 2014-01-08 三菱電機株式会社 面状光源装置および表示装置
TWI363907B (en) 2008-08-05 2012-05-11 Au Optronics Corp Backlight module and light emitting diode thereof
TWI363902B (en) 2008-12-05 2012-05-11 Au Optronics Corp Backlight module and led thereof
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KR101049481B1 (ko) * 2009-02-17 2011-07-15 주식회사 루멘스 발광 다이오드 패키지
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TWI496316B (zh) * 2009-03-24 2015-08-11 Lite On Electronics Guangzhou 發光二極體及其相關背光模組
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Also Published As

Publication number Publication date
KR20060135207A (ko) 2006-12-29
US20060291205A1 (en) 2006-12-28
JP4824484B2 (ja) 2011-11-30
EP1737051A1 (en) 2006-12-27
CN1885128A (zh) 2006-12-27
JP2007005791A (ja) 2007-01-11

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